Production process of antiskid shoe sole and antiskid pad

Abstract

The present application relates to the technical field of antiskid product production, and discloses a production process of antiskid shoe sole and antiskid pad, which comprises the following steps: S1, mixing; S2, calendering and sheeting; S3, mold pressing, cross-linking and foaming forming: placing the mold after loading into a flat vulcanizing machine to perform mold pressing, cross-linking and foaming forming, so as to obtain a formed product with antiskid patterns; S4, cooling and setting: performing forced cooling in the mode of cooling water flowing into the mold cooling channel, taking out the product after mold opening, naturally cooling to room temperature, and obtaining an antiskid shoe sole or antiskid pad finished product; and S5, surface treatment. Through the technical scheme of one-step completion of the vulcanization cross-linking and foaming process in the mold cavity and simultaneous integral forming of the reverse pattern of the antiskid pattern on the surface of the mold cavity, the technical effect of synchronous completion of vulcanization, foaming and pattern forming is achieved, and the problems of weak interlayer bonding force and poor pattern precision caused by step-by-step vulcanization and foaming are solved.

Description

Technical Field

[0001] This invention relates to the field of anti-slip product manufacturing technology, specifically to a manufacturing process for anti-slip shoe soles and anti-slip mats. Background Technology

[0002] Anti-slip soles and anti-slip mats are essential functional products in daily life, widely used in footwear manufacturing, bathroom anti-slip applications, sports equipment, and industrial anti-slip applications. Anti-slip soles are typically designed with a specific curved profile to suit the shoe shape, requiring a balance of good grip, wear resistance, and wearing comfort. Anti-slip mats are mostly flat sheet or roll structures, needing stable installation performance and durable anti-slip effect. With increasing demands for sports safety and quality of life, the market is placing higher requirements on the anti-slip performance, shock absorption and rebound, lightweight design, and lifespan of these products.

[0003] Currently, the production of anti-slip shoe soles and anti-slip mats mostly adopts a step-by-step process: pre-vulcanization, then transfer to a foaming mold for foaming, and finally machining to form anti-slip patterns. In this process, the cross-linked network formed by pre-vulcanization is basically fixed during subsequent foaming, resulting in weak interfacial bonding between the vulcanized layer and the foamed layer, and a decrease in the overall mechanical strength of the product. At the same time, the anti-slip patterns rely on subsequent machining, which is complex and makes it difficult to guarantee the precision of the patterns, ultimately affecting the anti-slip performance and service life of the product. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a production process for anti-slip shoe soles and anti-slip mats, which solves the problems of weak interlayer bonding and poor pattern precision caused by the separate vulcanization and foaming processes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a manufacturing process for anti-slip shoe soles and anti-slip mats, comprising the following steps: S1, Mixing: The base rubber, reinforcing filler, plasticizer, anti-slip functional filler, activator and antioxidant are added to the internal mixer in proportion for a first stage of mixing to obtain a first stage compound; then vulcanizing agent, vulcanization accelerator and foaming agent are added to the first stage compound for a second stage of mixing to obtain the final compound. S2, Calendering and Sheeting: The final rubber obtained in S1 is transferred to a two mill or calender for calendering and sheeting. After sheeting, it is cooled to room temperature by cooling rollers and allowed to stand for curing to obtain cured rubber sheets. S3, Compression Crosslinking Foaming Molding: The cured film obtained in S2 is cut and placed into a molding mold corresponding to the target product. The mold cavity surface of the molding mold is preset with a reverse anti-slip pattern. The mold after loading is placed in a flat vulcanizing machine for compression crosslinking foaming molding to obtain a molded product with anti-slip pattern. S4, Cooling and Shaping: The molded product obtained in S3, together with the mold, is subjected to forced cooling by introducing cooling water into the cooling channel of the mold under pressure. After cooling, the mold is opened and the product is taken out. It is then allowed to cool naturally to room temperature to obtain the finished product of anti-slip shoe sole or anti-slip mat.

[0006] By adopting the above technical solution, since the vulcanization and foaming processes are completed in one step within the mold cavity, the vulcanizing agent induces the cross-linking of rubber molecular chains while the foaming agent decomposes and releases gas, which pushes the rubber material to fully fill the mold cavity and replicate the details of the anti-slip pattern. Therefore, the simultaneous vulcanization and foaming avoids the problems of weak interlayer bonding and poor pattern accuracy caused by vulcanization followed by foaming in the step-by-step process. The resulting product has excellent mechanical strength, clear anti-slip pattern, and production efficiency.

[0007] Preferably, in step S1, the temperature of the first mixing stage is 110–135°C, and the time is 8–15 min. The temperature of the two-stage mixing is 85–105°C, and the time is 3–6 minutes.

[0008] By adopting the above technical solution, since the first stage of mixing completes the full dispersion and plasticization of the base rubber and fillers at a higher temperature, and the second stage of mixing adds vulcanizing agents, accelerators and foaming agents at a lower temperature, the vulcanizing agents and foaming agents are prevented from undergoing cross-linking reaction or decomposition failure in the first stage of high-temperature mixing, thus ensuring the uniform distribution of each component in the rubber compound and the stability of subsequent processes.

[0009] Preferably, in S1, each raw material comprises the following parts by weight: 50-80 parts of base rubber, 20-45 parts of reinforcing filler, 3-10 parts of plasticizer, 5-15 parts of anti-slip functional filler, 2-5 parts of activator, 1-3 parts of antioxidant, 1.5-3 parts of vulcanizing agent, 0.8-2 parts of vulcanization accelerator, and 2-6 parts of foaming agent.

[0010] By adopting the above technical solution, the components are used in a synergistic manner within a specific range. The matrix rubber ensures the elasticity and processability of the substrate, the reinforcing filler provides mechanical support, the anti-slip filler imparts surface roughness, and the foaming agent controls the foaming ratio within a suitable range. Therefore, the resulting product achieves a balance between density, hardness, tensile strength, anti-slip performance, and wear resistance.

[0011] Preferably, the base rubber is one or a mixture of natural rubber, butadiene rubber, and styrene-butadiene rubber; When multiple types of rubber are used in combination, the amount of natural rubber should account for 30% to 50% of the total mass of the base rubber. The anti-slip functional filler is one or more of silicon carbide particles, boron carbide particles, and alumina particles, with an average particle size of 10-100 μm. The foaming agent is azodicarbonamide and 4,4'-oxobis(benzenesulfonyl hydrazine) or any one thereof; The vulcanizing agent is sulfur, and the vulcanization accelerator is a combination of N-cyclohexyl-2-benzothiazole sulfenamide and diphenylguanidine, with a mass ratio of 1.5:1 to 2.5:1.

[0012] By adopting the above technical solutions, natural rubber provides good processing viscosity and raw rubber strength, while butadiene rubber and styrene-butadiene rubber impart excellent wear resistance and aging resistance. The combined use of these three materials and the control of the natural rubber ratio ensure that the rubber compound balances processing performance and product mechanical properties. Silicon carbide, boron carbide, and alumina particles have high hardness and angular morphology, and their particle size, within an appropriate range, can form effective microscopic protrusions on the surface of the product, increasing the coefficient of friction. The decomposition temperature of azodicarbonamide and 4,4'-oxobisbenzenesulfonyl hydrazine are well matched with the vulcanization temperature, and the foaming process and crosslinking process are carried out simultaneously. Accelerators CZ and D are compounded in a specific ratio to ensure suitable vulcanization induction period and vulcanization rate. Therefore, the rubber compound is fully flowed and filled in the mold before rapid crosslinking and shaping, ensuring pattern accuracy and foaming uniformity.

[0013] Preferably, in step S2, the temperature of the calendering roller is 50–70°C, the thickness of the resulting film is 1.5–4.0 mm, and the settling and curing time is 6–24 h.

[0014] By adopting the above technical solution, the roller temperature is controlled within an appropriate range to give the rubber compound suitable plasticity, which is convenient for calendering into rubber sheets of uniform thickness. At the same time, the temperature is lower than the initial reaction temperature of the vulcanizing agent and the foaming agent, thus avoiding premature reaction. The static curing process allows the internal stress generated by shearing during the mixing process to be fully released, and the vulcanizing agent and the accelerator to be fully diffused and balanced in the rubber compound. Therefore, the uniformity of the subsequent molding vulcanization reaction and the consistency of the product performance are improved.

[0015] Preferably, in step S2, the specific process of calendering and sheeting is as follows: the final rubber compound is first passed through a two-roll mill 3 to 5 times with a roller gap of 0.5 to 1.0 mm, and then the roller gap is adjusted to the target thickness for sheeting.

[0016] By adopting the above technical solution, the thin-pass process further disperses and evenly distributes the components in the rubber compound through multiple extrusion and shearing with small roller gaps, eliminating the local agglomeration that may exist during the mixing process. At the same time, the Mooney viscosity of the rubber compound is adjusted to a suitable range. Therefore, the calendered sheets are of uniform thickness and have a smooth surface, providing a homogeneous blank for subsequent molding.

[0017] Preferably, in step S3, the temperature for compression molding and cross-linking foaming is 155–175°C, the pressure is 12–20 MPa, and the time is 10–20 min. The foaming ratio is 1.2 to 1.8 times, the average diameter of the internal cells of the foamed product is 50 to 200 μm, and the apparent density of the product is 0.55 to 0.85 g / cm³. 3 .

[0018] By adopting the above technical solution, the molding temperature simultaneously meets the activation energy requirements for the vulcanizing agent to initiate the cross-linking reaction and the foaming agent to decompose and generate gas. The molding pressure ensures that the rubber compound fully fills the mold cavity. The foaming ratio is controlled within an appropriate range so that the product can obtain appropriate elasticity and shock absorption while maintaining sufficient mechanical strength. The cell diameter belongs to the category of microporous foaming. Therefore, the product has the advantages of moderate density, fine and uniform cell structure, and a balance between mechanical properties and shock absorption comfort.

[0019] Preferably, in step S4, the forced cooling rate is 3-8°C / min, and the mold is opened and the product is removed after the mold temperature drops to 40-60°C.

[0020] By adopting the above technical solution, forced cooling at an appropriate cooling rate under pressure conditions allows the internal pressure of the foamed product to decrease steadily as the temperature decreases. The cross-linked network gradually solidifies during the cooling process, and the product has sufficient dimensional stability when cooled to a suitable temperature. Therefore, the product will not expand and deform or have blurred surface patterns due to the instantaneous release of internal air pressure when the mold is opened, thus ensuring the dimensional accuracy and clarity of the anti-slip pattern.

[0021] Preferably, in step S3, the molding die is a shoe sole molding die or an anti-slip mat molding die; When the target product is a non-slip shoe sole, a shoe sole molding mold with a cavity that has the outline of the shoe sole should be selected; When the target product is an anti-slip mat, an anti-slip mat molding mold with a sheet-like cavity should be selected; Both types of molding dies have the anti-slip pattern reversed on the mold cavity surface.

[0022] By adopting the above technical solution, since the mold selection for both products is unified into the same process flow, only the mold with the corresponding cavity shape needs to be changed according to the target product, while other steps and process parameters remain unchanged. Therefore, the same production line can flexibly switch to produce anti-slip shoe soles or anti-slip mats, which improves the utilization rate of production equipment and the versatility of the process.

[0023] Preferably, after S4, the process further includes S5 surface treatment: The anti-slip shoe soles or anti-slip mats obtained in S4 are placed in a plasma treatment device and subjected to plasma treatment in an atmospheric pressure air atmosphere. The plasma treatment power is 200-500W, and the treatment speed is 0.5-2m / min.

[0024] By adopting the above technical solution, the high-energy active particles in the atmospheric pressure air plasma physically etch and chemically activate the surface of the product, forming a finer rough structure on the anti-slip pattern surface and introducing oxygen-containing polar groups, thereby improving the surface energy and water wettability. Therefore, without changing the geometric dimensions and pattern morphology of the product, the friction coefficient and anti-slip performance of the product under wet conditions are significantly improved.

[0025] This invention provides a manufacturing process for anti-slip shoe soles and anti-slip mats. It has the following beneficial effects: 1. This invention achieves the technical effect of simultaneous vulcanization, foaming and pattern forming by adopting a technical solution that completes the vulcanization crosslinking and foaming processes in one step within the mold cavity, and simultaneously pre-setting the anti-slip pattern on the surface of the mold cavity. Compared with the existing technology that pre-vulcanizes first and then transfers to the foaming mold for step-by-step forming, and the anti-slip pattern is formed by subsequent mechanical grinding, this invention solves the problems of weak interlayer bonding and poor pattern accuracy caused by the step-by-step vulcanization and foaming.

[0026] 2. The present invention adopts a process scheme in which cooling water is introduced into the cooling channel of the mold for forced cooling and shaping after compression cross-linking foaming and under pressure. This achieves the technical effect of dimensional stability and clear and complete anti-slip pattern during the cooling process. Compared with the natural cooling method of directly opening the mold after foaming in the prior art, this invention solves the problem of product volume expansion and deformation and blurred surface pattern caused by the instantaneous release of internal air pressure.

[0027] 3. The present invention adopts a technical solution of plasma surface treatment under normal pressure air atmosphere for the finished anti-slip shoe sole or anti-slip mat after cooling and shaping. This achieves the technical effect of forming a finer rough structure and introducing polar groups on the surface of the anti-slip pattern of the product. Compared with the existing technology, which does not have surface treatment or only uses simple cleaning treatment, it solves the problem of poor surface wettability and insufficient coefficient of friction of the product under wet and slippery conditions. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the production process of an anti-slip shoe sole and anti-slip mat according to the present invention; Figure 2 This is a schematic diagram of the S1 mixing and S2 calendering process in the production process of an anti-slip shoe sole and anti-slip mat according to the present invention. Figure 3 This is a schematic diagram of the S3 compression molding cross-linking foaming process for the production of an anti-slip shoe sole and anti-slip mat according to the present invention; Figure 4 This is a schematic diagram of the S4 cooling and shaping and S5 surface treatment processes in the production process of an anti-slip shoe sole and anti-slip mat according to the present invention. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see the appendix Figure 1 - Appendix Figure 4 The following is a further description with reference to the embodiments: Example 1: A manufacturing process for anti-slip shoe soles and anti-slip mats includes the following steps: S1, Mixing: Take 20 parts of natural rubber, 30 parts of butadiene rubber, and 15 parts of styrene-butadiene rubber as the base rubber, add 30 parts of precipitated silica, 6 parts of naphthenic oil as plasticizer, 10 parts of silicon carbide particles with an average particle size of 50μm, 3 parts of zinc oxide, 1.5 parts of stearic acid, and 2 parts of antioxidant RD, put them into an internal mixer, and mix them for 12 minutes at a temperature of 120℃ to obtain a first-stage compound. After the temperature of the first-stage compound rubber drops to 95℃, add 2.2 parts of sulfur, 1.2 parts of accelerator CZ, 0.6 parts of accelerator D, and 4 parts of azodicarbonamide foaming agent. Then, carry out a second-stage compounding at 95℃ for 4 minutes to obtain the final compound rubber.

[0031] S2, Calendering and Sheeting: The final rubber compound obtained in S1 is transferred to a two-roll mill and passed through a thin pass four times with a roll gap of 0.8 mm. Then, the roll gap is adjusted to 2.5 mm, and the rubber is calendered at a roll temperature of 55°C to obtain a sheet with a thickness of 2.5 mm. After sheeting, it is cooled to room temperature by cooling rollers and placed in a constant temperature and humidity environment of 25°C and 60% relative humidity for 12 hours to cure, thus obtaining a cured rubber sheet.

[0032] S3, Compression Crosslinking Foaming Molding: After cutting the cured film obtained in S2 to the required size, mold selection is performed. When the target product is an anti-slip shoe sole, a shoe sole molding mold with a cavity featuring the outline of the shoe sole is selected; when the target product is an anti-slip mat, an anti-slip mat molding mold with a sheet-like cavity is selected. The surface of the mold cavity for both types of molding molds is pre-set with a reverse diamond-shaped grid anti-slip pattern, and the groove depth is 2.0 mm. The cut cured rubber sheet is placed into the selected molding mold. The mold with the material is then placed in a flat vulcanizing machine and subjected to compression molding, cross-linking, and foaming at 165℃ and 15MPa for 15 minutes. During this process, the rubber compound undergoes vulcanization, cross-linking, and foaming simultaneously within the mold cavity. The foaming ratio is 1.5 times, and the average diameter of the internal cells in the foamed product is 80–120 μm, with an apparent density of 0.68 g / cm³. 3 .

[0033] S4, Cooling and Shaping: After S3, forced cooling is performed under pressure by introducing cooling water into the mold's cooling channels. The cooling water flows in from the periphery of the mold and out from the center, with the cooling rate controlled at 5℃ / min to ensure that the temperature difference between different areas of the mold does not exceed 5℃. After the mold temperature drops to 50℃, the mold is opened and the product is removed. It is then allowed to cool naturally to room temperature to obtain the finished anti-slip shoe sole or anti-slip mat.

[0034] Example 2: A manufacturing process for an anti-slip shoe sole and anti-slip mat, comprising the following steps: S1, Mixing: Take 30 parts of natural rubber and 40 parts of styrene-butadiene rubber as the base rubber, add 25 parts of carbon black N220, 5 parts of naphthenic oil, 12 parts of boron carbide particles with an average particle size of 30μm, 2.5 parts of zinc oxide, 1.5 parts of stearic acid, and 1.5 parts of antioxidant RD, put them into an internal mixer, and mix them for 10 minutes at a temperature of 130℃ to obtain a first-stage compound. After the temperature of the first-stage compound rubber drops to 90℃, add 1.8 parts of sulfur, 1.0 parts of accelerator CZ, 0.5 parts of accelerator D, and 3.5 parts of 4,4'-oxobisbenzenesulfonylhydrazine foaming agent. Then, carry out a second-stage mixing at 90℃ for 5 minutes to obtain the final compound rubber.

[0035] S2, Calendering and Sheeting: The final rubber compound obtained in S1 is transferred to a two-roll mill and passed through a thin pass 5 times with a roll gap of 0.6 mm. Then, the roll gap is adjusted to 3.0 mm, and the rubber is calendered at a roll temperature of 60°C to obtain a sheet with a thickness of 3.0 mm. After sheeting, it is cooled to room temperature by cooling rollers and placed in a constant temperature and humidity environment of 20°C and 65% relative humidity for 18 hours to cure, thus obtaining a cured rubber sheet.

[0036] S3, Compression Crosslinking Foaming Molding: After cutting the cured film obtained in S2, a mold is selected. When the target product is an anti-slip shoe sole, a shoe sole molding mold with a cavity featuring the outline of the shoe sole is selected; when the target product is an anti-slip mat, an anti-slip mat molding mold with a sheet-like cavity is selected. The surface of the mold cavity for both types of molding molds is pre-set with a corrugated anti-slip pattern in reverse, with a groove depth of 1.5mm. The cut cured rubber sheet is placed into the selected molding mold. The mold with the filling is then placed in a flat vulcanizing machine and subjected to compression molding, cross-linking, and foaming at 170℃ and 18MPa for 12 minutes. The foaming ratio is 1.4 times. After foaming, the average diameter of the internal cells of the product is 60-100μm, and the apparent density of the product is 0.72g / cm³. 3 .

[0037] S4, Cooling and Shaping: After S3, forced cooling is performed under pressure by introducing cooling water into the mold's cooling channels. The cooling water flows in from the periphery of the mold and out from the center, with the cooling rate controlled at 6℃ / min to ensure that the temperature difference between different areas of the mold does not exceed 5℃. After the mold temperature drops to 45℃, the mold is opened and the product is removed. It is then allowed to cool naturally to room temperature to obtain the finished anti-slip shoe sole or anti-slip mat.

[0038] S5, Surface treatment: The anti-slip shoe sole or anti-slip mat product obtained in S4 is placed in an atmospheric pressure plasma treatment device. Under an air atmosphere, the surface of the product is subjected to plasma treatment with parameters of 350W power and 1.0m / min to obtain the surface-modified anti-slip shoe sole or anti-slip mat product.

[0039] Example 3: A manufacturing process for anti-slip shoe soles and anti-slip mats. This example uses an anti-slip mat as a specific example and includes the following steps: S1, Mixing: Take 25 parts of natural rubber and 25 parts of butadiene rubber as the base rubber, add 20 parts of precipitated silica, 15 parts of carbon black N220, 8 parts of naphthenic oil, 8 parts of alumina particles with an average particle size of 80μm, 7 parts of silicon carbide particles with an average particle size of 50μm, 4 parts of zinc oxide, 2 parts of stearic acid, and 2.5 parts of antioxidant RD. Put them into an internal mixer and mix for 15 minutes at a temperature of 115℃ to obtain a first-stage compound. After the temperature of the first-stage compound rubber drops to 100℃, add 2.5 parts of sulfur, 1.5 parts of accelerator CZ, 0.7 parts of accelerator D, 2.5 parts of azodicarbonamide foaming agent, and 2.5 parts of 4,4'-oxobisbenzenesulfonyl hydrazine foaming agent. Then, carry out a second-stage mixing at 100℃ for 3 minutes to obtain the final compound rubber.

[0040] S2, Calendering and Sheeting: The final rubber compound obtained in S1 is transferred to a calender and calendered at a roller temperature of 50°C to obtain a sheet with a thickness of 3.5 mm. After sheeting, it is cooled to room temperature by cooling rollers and placed in a constant temperature and humidity environment of 28°C and 55% relative humidity for 24 hours to obtain a cured rubber sheet.

[0041] S3, Compression Crosslinking Foaming Molding: In this embodiment, the anti-slip mat is the target product. An anti-slip mat molding mold with a sheet-like cavity is selected. The surface of the mold cavity of the anti-slip mat molding mold is preset with an arrow-shaped anti-slip pattern in reverse, and the groove depth is 2.5mm. After cutting the cured film obtained from S2, it was placed into the selected anti-slip mat molding mold. The mold with the filling was then placed in a flat vulcanizing machine and subjected to compression molding, cross-linking, and foaming at a temperature of 160℃ and a pressure of 14MPa for 18 minutes. The foaming ratio was 1.6 times. After foaming, the average diameter of the internal cells of the product was 100-180μm, and the apparent density of the product was 0.60g / cm³.3 During the molding process, the reaction endpoint is determined by monitoring the pressure change inside the mold cavity. When the pressure change inside the cavity is less than 0.1 MPa within 30 seconds, the process proceeds to S4.

[0042] S4, Cooling and Shaping: After S3, forced cooling is performed under pressure by introducing cooling water into the mold's cooling channels. The cooling water flows in from the periphery of the mold and out from the center, with the cooling rate controlled at 4℃ / min to ensure that the temperature difference between different areas of the mold does not exceed 5℃. After the mold temperature drops to 55℃, the mold is opened and the product is removed. It is then allowed to cool naturally to room temperature to obtain the finished anti-slip mat.

[0043] S5, Surface treatment: The anti-slip mat product obtained in S4 is placed in an atmospheric pressure plasma treatment device. Under an air atmosphere, the surface of the product is subjected to plasma treatment with parameters of 250W power and 1.5m / min processing speed to obtain the surface-modified anti-slip mat product.

[0044] Example 4: A manufacturing process for anti-slip shoe soles and anti-slip mats, comprising the following steps: S1, Mixing: Take 35 parts of natural rubber, 15 parts of butadiene rubber, and 10 parts of styrene-butadiene rubber as the base rubber, add 35 parts of precipitated silica, 4 parts of naphthenic oil, 8 parts of silicon carbide particles with an average particle size of 20 μm, 5 parts of boron carbide particles with an average particle size of 40 μm, 3 parts of zinc oxide, 1.5 parts of stearic acid, and 2 parts of antioxidant RD, put them into an internal mixer, and mix them for 8 minutes at a temperature of 125℃ to obtain a first-stage compound. After the temperature of the first-stage compound drops to 85℃, add 2.0 parts of sulfur, 1.0 part of accelerator CZ, 0.5 parts of accelerator D, and 5 parts of azodicarbonamide foaming agent. Then, carry out a second-stage compounding at 85℃ for 6 minutes to obtain the final compound.

[0045] S2, Calendering and Sheeting: The final rubber compound obtained in S1 is transferred to a two-roll mill and passed through a thin pass three times with a roll gap of 1.0 mm. Then, the roll gap is adjusted to 2.0 mm, and the rubber is calendered at a roll temperature of 65°C to obtain a sheet with a thickness of 2.0 mm. After sheeting, it is cooled to room temperature by cooling rollers and placed in a constant temperature and humidity environment of 22°C and 50% relative humidity for 8 hours to obtain a cured rubber sheet.

[0046] S3. Compression Crosslinking Foaming Molding: After cutting the cured film obtained in S2, select a mold. When the target product is an anti-slip shoe sole, select a shoe sole molding mold with a cavity featuring the outline of the shoe sole; when the target product is an anti-slip mat, select an anti-slip mat molding mold with a sheet-like cavity. The surface of the mold cavity for both types of molding molds is pre-set with a reverse anti-slip pattern combining diamond-shaped grids and arrow shapes, with a groove depth of 1.0 mm. The cut cured rubber sheet is placed into the selected molding mold. The mold with the filling is then placed in a flat vulcanizing machine and subjected to compression molding, cross-linking, and foaming at a temperature of 155℃ and a pressure of 20MPa for 20 minutes. The foaming ratio is 1.2 times. After foaming, the average diameter of the internal cells of the product is 50-90μm, and the apparent density of the product is 0.82g / cm³. 3 .

[0047] S4. Cooling and Shaping: After S3, forced cooling is performed under pressure by introducing cooling water into the mold's cooling channels. The cooling water flows in from the periphery of the mold and out from the center, with a cooling rate controlled at 3℃ / min to ensure that the temperature difference between different areas of the mold does not exceed 5℃. Once the mold temperature drops to 40℃, the mold is opened and the product is removed. It is then allowed to cool naturally to room temperature to obtain the finished anti-slip shoe sole or anti-slip mat.

[0048] Comparative Example 1: Anti-slip shoe soles or anti-slip mats were prepared using a traditional molding foaming process. The same formulation as in Example 2 was mixed, pre-vulcanized in a vulcanizing machine at 145°C for 5 minutes, then transferred to a foaming mold and foamed at 165°C for 10 minutes. After cooling and removal, anti-slip textures were formed on the surface by mechanical polishing. Subsequently, plasma surface treatment was performed under the same conditions as in Example 2, with all other conditions remaining the same.

[0049] Comparative Example 2: The amount of 4,4'-oxobisbenzenesulfonylhydrazine foaming agent in the formulation of Example 2 was adjusted from 3.5 parts to 1.5 parts, and the rest was the same as in Example 2.

[0050] Comparative Example 3: The pressure holding and cooling in Example 2S4 was changed to natural cooling after mold opening, and the rest was the same as in Example 2.

[0051] Comparative Example 4 is the complete process of Example 2, but without the S5 plasma surface treatment. That is, after S4, the finished anti-slip shoe sole or anti-slip mat is obtained directly. The rest is the same as Example 2.

[0052] Comparative Example 5: The surface of the mold cavity of the molding die in Example 2S3 was changed to a smooth plane. After demolding, a corrugated anti-slip texture of the same depth was formed on the surface of the product by mechanical grinding. The rest was the same as in Example 2.

[0053] Table 1. Performance test results of products in each embodiment.

[0054] Table 2. Performance test results of the comparative product

[0055] As shown in Table 1, Examples 1-4 all adopted the process of this invention, which involves one-step compression molding, cross-linking, foaming, and pressure-holding with forced cooling. The resulting products have moderate density, excellent mechanical properties, high coefficients of friction in both dry and wet states, clear and complete anti-slip patterns, and dimensional stability. Among them, Example 2 exhibits the best overall performance, with a tensile strength of 15.8 MPa and a DIN wear of only 68 mm. 3 The wet friction coefficient was the highest in the four embodiments, at 0.58, and the dimensional deviation rate was the lowest, at 0.2%.

[0056] As shown in Table 2, the comparison is based on the optimal embodiment 2: Comparative Example 1, using a traditional step-by-step process, showed a 29% decrease in tensile strength, a 22% decrease in dry-state friction coefficient, a 34% decrease in wet-state friction coefficient, an 84% increase in DIN wear, and poor clarity of the anti-slip pattern compared to Example 2. This indicates that the one-step compression molding and cross-linking foaming process of this invention can effectively avoid the problems of poor interlayer bonding and poor pattern precision caused by step-by-step vulcanization and foaming.

[0057] Comparative Example 2: The amount of foaming agent was adjusted to below the lower limit of the scope of this invention, and the apparent density of the product increased to 0.95 g / cm³. 3 The hardness is too high, and the wet friction coefficient decreases by 10%. This indicates that insufficient foaming agent will lead to incomplete foaming and affect the anti-slip performance.

[0058] Comparative Example 3, without pressure holding and cooling, showed a significant increase in the dimensional deviation rate of the product to 2.8%, and the clarity of the anti-slip pattern decreased to "good." This indicates that pressure holding and forced cooling play a crucial role in ensuring the dimensional accuracy and pattern clarity of the product.

[0059] Comparative Example 4, without plasma surface treatment, showed a decrease in the wet friction coefficient from 0.58 to 0.45, a reduction of 22%. This indicates that plasma surface treatment can significantly improve the wet anti-slip performance of the product.

[0060] Comparative Example 5, which did not use a pre-set pattern in the mold but instead employed subsequent mechanical grinding, saw its dry friction coefficient decrease from 0.82 to 0.63, a reduction of 23%, while the clarity of the anti-slip pattern remained poor. This indicates that integral molding of the anti-slip pattern in the mold better ensures pattern accuracy and anti-slip performance than subsequent mechanical grinding.

[0061] In summary, this invention combines mixing, calendering, compression molding, cross-linking, foaming, and pressure holding with cooling to complete the vulcanization, cross-linking, and foaming processes in a single step within the mold cavity. Combined with plasma surface treatment, this results in products with excellent mechanical strength, anti-slip properties, and dimensional stability. This process is versatile; simply changing the molding die in step S3 allows it to be used for the production of anti-slip shoe soles and anti-slip mats, offering significant process advantages, product performance advantages, and wide applicability.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for anti-slip shoe soles and anti-slip mats, characterized in that, Includes the following steps: S1, Mixing: The base rubber, reinforcing filler, plasticizer, anti-slip functional filler, activator and antioxidant are added to the internal mixer in proportion for a first stage of mixing to obtain a first stage compound; then vulcanizing agent, vulcanization accelerator and foaming agent are added to the first stage compound for a second stage of mixing to obtain the final compound. S2, Calendering and Sheeting: The final rubber obtained in S1 is transferred to a two mill or calender for calendering and sheeting. After sheeting, it is cooled to room temperature by cooling rollers and allowed to stand for curing to obtain cured rubber sheets. S3, Compression Crosslinking Foaming Molding: The cured film obtained in S2 is cut and placed into a molding mold corresponding to the target product. The mold cavity surface of the molding mold is preset with a reverse anti-slip pattern. The mold after loading is placed in a flat vulcanizing machine for compression crosslinking foaming molding to obtain a molded product with anti-slip pattern. S4, Cooling and Shaping: The molded product obtained in S3, together with the mold, is subjected to forced cooling by introducing cooling water into the cooling channel of the mold under pressure. After cooling, the mold is opened and the product is taken out. It is then allowed to cool naturally to room temperature to obtain the finished product of anti-slip shoe sole or anti-slip mat.

2. The manufacturing process of the anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In S1, the temperature of the first mixing stage is 110-135℃, and the time is 8-15 minutes. The temperature of the two-stage mixing is 85–105°C, and the time is 3–6 minutes.

3. The manufacturing process of the anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In S1, each raw material includes the following parts by weight: 50-80 parts of base rubber, 20-45 parts of reinforcing filler, 3-10 parts of plasticizer, 5-15 parts of anti-slip functional filler, 2-5 parts of activator, 1-3 parts of antioxidant, 1.5-3 parts of vulcanizing agent, 0.8-2 parts of vulcanization accelerator, and 2-6 parts of foaming agent.

4. The manufacturing process of an anti-slip shoe sole and anti-slip mat according to claim 3, characterized in that, The base rubber is one or a mixture of natural rubber, butadiene rubber, and styrene-butadiene rubber; When multiple types of rubber are used in combination, the amount of natural rubber should account for 30% to 50% of the total mass of the base rubber. The anti-slip functional filler is one or more of silicon carbide particles, boron carbide particles, and alumina particles, with an average particle size of 10-100 μm. The foaming agent is azodicarbonamide and 4,4'-oxobis(benzenesulfonyl hydrazine) or any one thereof; The vulcanizing agent is sulfur, and the vulcanization accelerator is a combination of N-cyclohexyl-2-benzothiazole sulfenamide and diphenylguanidine, with a mass ratio of 1.5:1 to 2.5:

1.

5. The manufacturing process of the anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In step S2, the temperature of the calendering rollers is 50–70°C, the thickness of the resulting film is 1.5–4.0 mm, and the settling and curing time is 6–24 h.

6. The manufacturing process of an anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In S2, the specific process of calendering and sheeting is as follows: the final rubber is first thin-passed 3 to 5 times on a two-roll mill with a thin-passing roll gap of 0.5 to 1.0 mm, and then the roll gap is adjusted to the target thickness for sheeting.

7. The manufacturing process of an anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In step S3, the temperature for compression molding and cross-linking foaming is 155–175°C, the pressure is 12–20 MPa, and the time is 10–20 min. The foaming ratio is 1.2-1.8, the average diameter of the inner cell of the foamed product is 50-200 μm, and the apparent density of the product is 0.55-0.85 g / cm 3 .

8. The manufacturing process of an anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In step S4, the forced cooling rate is 3-8°C / min, and the mold is opened and the product is removed after the mold temperature drops to 40-60°C.

9. The manufacturing process of an anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, In S3, the forming mold is a shoe sole forming mold or an anti-slip mat forming mold; When the target product is a non-slip shoe sole, a shoe sole molding mold with a cavity that has the outline of the shoe sole should be selected; When the target product is an anti-slip mat, an anti-slip mat molding mold with a sheet-like cavity should be selected; Both types of molding dies have the anti-slip pattern reversed on the mold cavity surface.

10. The manufacturing process of an anti-slip shoe sole and anti-slip mat according to claim 1, characterized in that, Following S4, surface treatment S5 is also included: The anti-slip shoe soles or anti-slip mats obtained in S4 are placed in a plasma treatment device and subjected to plasma treatment in an atmospheric pressure air atmosphere. The plasma treatment power is 200-500W, and the treatment speed is 0.5-2m / min.

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